Feature: Reset by time

README.md

@@ -720,6 +720,10 @@ kafkactl reset offset my-group --topic my-topic --partition 5 --offset 100
 kafkactl reset offset my-group --all-topics --newest
 # reset offset of for all partitions on multiple topics to oldest offset
 kafkactl reset offset my-group --topic my-topic-a --topic my-topic-b --oldest
+# reset offset to offset at a given timestamp(epoch)/datetime
+kafkactl reset offset my-group --topic my-topic-a --to-datetime 2014-04-26T17:24:37.123Z
+# reset offset to offset at a given timestamp(epoch)/datetime
+kafkactl reset offset my-group --topic my-topic-a --to-datetime 1697726906352
 ```
 
 ### Delete consumer group offsets

cmd/alter/alter-partition.go

@@ -44,9 +44,8 @@ func newAlterPartitionCmd() *cobra.Command {
 				return topic.CompleteTopicNames(cmd, args, toComplete)
 			} else if len(args) == 1 {
 				return partition.CompletePartitionIds(cmd, args, toComplete)
-			} else {
-				return nil, cobra.ShellCompDirectiveNoFileComp
 			}
+			return nil, cobra.ShellCompDirectiveNoFileComp
 		},
 	}
 

cmd/reset/reset-consumer-group-offset.go

@@ -35,6 +35,7 @@ func newResetOffsetCmd() *cobra.Command {
 	cmdResetOffset.Flags().StringArrayVarP(&offsetFlags.Topic, "topic", "t", offsetFlags.Topic, "one ore more topics to change offset for")
 	cmdResetOffset.Flags().BoolVarP(&offsetFlags.Execute, "execute", "e", false, "execute the reset (as default only the results are displayed for validation)")
 	cmdResetOffset.Flags().StringVarP(&offsetFlags.OutputFormat, "output", "o", offsetFlags.OutputFormat, "output format. One of: json|yaml")
+	cmdResetOffset.Flags().StringVarP(&offsetFlags.ToDatetime, "to-datetime", "", "", "set the offset to offset of given timestamp")
 
 	return cmdResetOffset
 }

cmd/reset/reset-consumer-group-offset_test.go

@@ -3,6 +3,7 @@ package reset_test
 import (
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/deviceinsight/kafkactl/testutil"
 )
@@ -130,6 +131,48 @@ func TestResetCGOForAllTopicsInTheGroupIntegration(t *testing.T) {
 	testutil.VerifyTopicNotInConsumerGroup(t, group, topicOther)
 }
 
+func TestResetCGOToDatetimeIntegration(t *testing.T) {
+
+	testutil.StartIntegrationTest(t)
+
+	topicName := testutil.CreateTopic(t, "reset-cgo-datetime")
+
+	group := testutil.CreateConsumerGroup(t, "reset-cgo-datetime", topicName)
+
+	testutil.ProduceMessage(t, topicName, "test-key", "a", 0, 0)
+	testutil.ProduceMessage(t, topicName, "test-key", "b", 0, 1)
+
+	time.Sleep(1 * time.Millisecond) // need to have messaged produced at different milliseconds to have reproducible test
+
+	t1 := time.Now()
+	t1Formatted := t1.Format("2006-01-02T15:04:05.000Z")
+
+	testutil.ProduceMessage(t, topicName, "test-key", "c", 0, 2)
+	testutil.ProduceMessage(t, topicName, "test-key", "d", 0, 3)
+	testutil.ProduceMessage(t, topicName, "test-key", "e", 0, 4)
+	testutil.ProduceMessage(t, topicName, "test-key", "f", 0, 5)
+
+	testutil.VerifyConsumerGroupOffset(t, group, topicName, 0)
+
+	//test with --to-datetime
+	kafkaCtl := testutil.CreateKafkaCtlCommand()
+
+	if _, err := kafkaCtl.Execute("reset", "offset", group, "--topic", topicName, "--to-datetime", t1Formatted, "--execute"); err != nil {
+		t.Fatalf("failed to execute command: %v", err)
+	}
+
+	testutil.VerifyConsumerGroupOffset(t, group, topicName, 2)
+
+	kafkaCtl = testutil.CreateKafkaCtlCommand()
+
+	if _, err := kafkaCtl.Execute("consume", topicName, "--group", group, "--max-messages", "4"); err != nil {
+		t.Fatalf("failed to execute command: %v", err)
+	}
+
+	messages := strings.Split(strings.TrimSpace(kafkaCtl.GetStdOut()), "\n")
+	testutil.AssertArraysEquals(t, []string{"c", "d", "e", "f"}, messages)
+}
+
 func TestResetCGOAutoCompletionIntegration(t *testing.T) {
 
 	testutil.StartIntegrationTest(t)

internal/broker/broker-operation.go

@@ -163,40 +163,40 @@ func (operation *Operation) DescribeBroker(id int32, flags DescribeBrokerFlags)
 		return output.PrintObject(brokerInfo, flags.OutputFormat)
 	} else if flags.OutputFormat != "" && flags.OutputFormat != "wide" {
 		return errors.Errorf("unknown outputFormat: %s", flags.OutputFormat)
-	} else {
-
-		tableWriter := output.CreateTableWriter()
+	}
 
-		// write broker info table
-		if err := tableWriter.WriteHeader("ID", "ADDRESS"); err != nil {
-			return err
-		}
+	tableWriter := output.CreateTableWriter()
 
-		if err := tableWriter.Write(fmt.Sprint(brokerInfo.ID), brokerInfo.Address); err != nil {
-			return err
-		}
+	// write broker info table
+	if err := tableWriter.WriteHeader("ID", "ADDRESS"); err != nil {
+		return err
+	}
 
-		if err := tableWriter.Flush(); err != nil {
-			return err
-		}
+	if err := tableWriter.Write(fmt.Sprint(brokerInfo.ID), brokerInfo.Address); err != nil {
+		return err
+	}
 
-		output.PrintStrings("")
+	if err := tableWriter.Flush(); err != nil {
+		return err
+	}
 
-		// first write config table
-		if err := tableWriter.WriteHeader("CONFIG", "VALUE"); err != nil {
-			return err
-		}
+	output.PrintStrings("")
 
-		for _, c := range brokerInfo.Configs {
-			if err := tableWriter.Write(c.Name, c.Value); err != nil {
-				return err
-			}
-		}
+	// first write config table
+	if err := tableWriter.WriteHeader("CONFIG", "VALUE"); err != nil {
+		return err
+	}
 
-		if err := tableWriter.Flush(); err != nil {
+	for _, c := range brokerInfo.Configs {
+		if err := tableWriter.Write(c.Name, c.Value); err != nil {
 			return err
 		}
 	}
+
+	if err := tableWriter.Flush(); err != nil {
+		return err
+	}
+
 	return nil
 }
 

internal/common-operation.go

@@ -213,9 +213,8 @@ func GetClientID(context *ClientContext, defaultPrefix string) string {
 	} else if usr, err = user.Current(); err != nil {
 		output.Warnf("Failed to read current user: %v", err)
 		return strings.TrimSuffix(defaultPrefix, "-")
-	} else {
-		return defaultPrefix + sanitizeUsername(usr.Username)
 	}
+	return defaultPrefix + sanitizeUsername(usr.Username)
 }
 
 func sanitizeUsername(u string) string {

internal/consume/AvroMessageDeserializer.go

@@ -171,9 +171,8 @@ func (deserializer AvroMessageDeserializer) CanDeserialize(topic string) (bool,
 		return true, nil
 	} else if util.ContainsString(subjects, topic+"-value") {
 		return true, nil
-	} else {
-		return false, nil
 	}
+	return false, nil
 }
 
 func (deserializer AvroMessageDeserializer) Deserialize(rawMsg *sarama.ConsumerMessage, flags Flags) error {

internal/consume/PartitionConsumer.go

@@ -166,7 +166,7 @@ func getOffsetBounds(client *sarama.Client, topic string, flags Flags, currentPa
 
 // Converts string to epoch unix timestamp
 // The string might be null in that case, the flag is considered absent and the value -1 is returned
-func convertToEpocUnixMillis(timestamp string) (int64, error) {
+func ConvertToEpocUnixMillis(timestamp string) (int64, error) {
 	if timestamp == "" {
 		return -1, nil
 	}
@@ -178,7 +178,7 @@ func convertToEpocUnixMillis(timestamp string) (int64, error) {
 }
 
 func getStartOffset(client *sarama.Client, topic string, flags Flags, currentPartition int32) (int64, error) {
-	var fromUnixMillis, err = convertToEpocUnixMillis(flags.FromTimestamp)
+	var fromUnixMillis, err = ConvertToEpocUnixMillis(flags.FromTimestamp)
 	if err != nil {
 		return ErrOffset, err
 	}
@@ -191,13 +191,12 @@ func getStartOffset(client *sarama.Client, topic string, flags Flags, currentPar
 		return (*client).GetOffset(topic, currentPartition, sarama.OffsetOldest)
 	} else if len(flags.Offsets) > 0 {
 		return extractOffsetForPartition(flags, currentPartition)
-	} else {
-		return sarama.OffsetNewest, nil
 	}
+	return sarama.OffsetNewest, nil
 }
 
 func getEndOffset(client *sarama.Client, topic string, flags Flags, currentPartition int32) (int64, error) {
-	var toUnixMillis, err = convertToEpocUnixMillis(flags.ToTimestamp)
+	var toUnixMillis, err = ConvertToEpocUnixMillis(flags.ToTimestamp)
 	if err != nil {
 		return ErrOffset, err
 	}
@@ -210,9 +209,8 @@ func getEndOffset(client *sarama.Client, topic string, flags Flags, currentParti
 			return ErrOffset, err
 		}
 		return newestOffset, nil
-	} else {
-		return sarama.OffsetNewest, nil
 	}
+	return sarama.OffsetNewest, nil
 }
 
 func extractOffsetForPartition(flags Flags, currentPartition int32) (int64, error) {

internal/consumergroupoffsets/OffsetResettingConsumer.go

@@ -4,6 +4,7 @@ import (
 	"strconv"
 
 	"github.com/IBM/sarama"
+	"github.com/deviceinsight/kafkactl/internal/consume"
 	"github.com/deviceinsight/kafkactl/output"
 	"github.com/pkg/errors"
 )
@@ -49,7 +50,7 @@ func (consumer *OffsetResettingConsumer) Setup(session sarama.ConsumerGroupSessi
 	offsets := make([]partitionOffsets, 0)
 
 	if flags.Partition > -1 {
-		offset, err := resetOffset(consumer.client, consumer.topicName, flags.Partition, flags, groupOffsets, session)
+		offset, err := resetOffset(&consumer.client, consumer.topicName, flags.Partition, flags, groupOffsets, session)
 		if err != nil {
 			return err
 		}
@@ -62,7 +63,7 @@ func (consumer *OffsetResettingConsumer) Setup(session sarama.ConsumerGroupSessi
 		}
 
 		for _, partition := range partitions {
-			offset, err := resetOffset(consumer.client, consumer.topicName, partition, flags, groupOffsets, session)
+			offset, err := resetOffset(&consumer.client, consumer.topicName, partition, flags, groupOffsets, session)
 			if err != nil {
 				return err
 			}
@@ -102,7 +103,7 @@ func (consumer *OffsetResettingConsumer) ConsumeClaim(sarama.ConsumerGroupSessio
 	return nil
 }
 
-func resetOffset(client sarama.Client, topic string, partition int32, flags ResetConsumerGroupOffsetFlags, groupOffsets *sarama.OffsetFetchResponse, session sarama.ConsumerGroupSession) (partitionOffsets, error) {
+func resetOffset(client *sarama.Client, topic string, partition int32, flags ResetConsumerGroupOffsetFlags, groupOffsets *sarama.OffsetFetchResponse, session sarama.ConsumerGroupSession) (partitionOffsets, error) {
 	offset, err := getPartitionOffsets(client, topic, partition, flags)
 	if err != nil {
 		return offset, err
@@ -121,16 +122,26 @@ func resetOffset(client sarama.Client, topic string, partition int32, flags Rese
 	return offset, nil
 }
 
-func getPartitionOffsets(client sarama.Client, topic string, partition int32, flags ResetConsumerGroupOffsetFlags) (partitionOffsets, error) {
+func getPartitionOffsets(client *sarama.Client, topic string, partition int32, flags ResetConsumerGroupOffsetFlags) (partitionOffsets, error) {
 
 	var err error
 	offsets := partitionOffsets{Partition: partition}
 
-	if offsets.OldestOffset, err = client.GetOffset(topic, partition, sarama.OffsetOldest); err != nil {
+	if flags.ToDatetime != "" {
+		milliTime, err := consume.ConvertToEpocUnixMillis(flags.ToDatetime)
+		if err != nil {
+			return offsets, err
+		}
+		if offsets.TargetOffset, err = (*client).GetOffset(topic, partition, milliTime); err == nil {
+			return offsets, nil
+		}
+	}
+
+	if offsets.OldestOffset, err = (*client).GetOffset(topic, partition, sarama.OffsetOldest); err != nil {
 		return offsets, errors.Errorf("failed to get offset for topic %s Partition %d: %v", topic, partition, err)
 	}
 
-	if offsets.NewestOffset, err = client.GetOffset(topic, partition, sarama.OffsetNewest); err != nil {
+	if offsets.NewestOffset, err = (*client).GetOffset(topic, partition, sarama.OffsetNewest); err != nil {
 		return offsets, errors.Errorf("failed to get offset for topic %s Partition %d: %v", topic, partition, err)
 	}
 
@@ -139,9 +150,8 @@ func getPartitionOffsets(client sarama.Client, topic string, partition int32, fl
 			return offsets, errors.Errorf("cannot set offset for Partition %d: offset (%d) < oldest offset (%d)", partition, flags.Offset, offsets.OldestOffset)
 		} else if flags.Offset > offsets.NewestOffset {
 			return offsets, errors.Errorf("cannot set offset for Partition %d: offset (%d) > newest offset (%d)", partition, flags.Offset, offsets.NewestOffset)
-		} else {
-			offsets.TargetOffset = flags.Offset
 		}
+		offsets.TargetOffset = flags.Offset
 	} else {
 		if flags.OldestOffset {
 			offsets.TargetOffset = offsets.OldestOffset

internal/consumergroupoffsets/consumer-group-offset-operation.go

@@ -21,6 +21,7 @@ type ResetConsumerGroupOffsetFlags struct {
 	Execute           bool
 	OutputFormat      string
 	allowedGroupState string
+	ToDatetime        string
 }
 
 type ConsumerGroupOffsetOperation struct {

internal/producer/AvroMessageSerializer.go

@@ -106,9 +106,8 @@ func (serializer AvroMessageSerializer) CanSerialize(topic string) (bool, error)
 		return true, nil
 	} else if util.ContainsString(subjects, topic+"-value") {
 		return true, nil
-	} else {
-		return false, nil
 	}
+	return false, nil
 }
 
 func (serializer AvroMessageSerializer) Serialize(key, value []byte, flags Flags) (*sarama.ProducerMessage, error) {

internal/producer/producer-operation.go

@@ -339,9 +339,8 @@ func resolveColumns(line []string) (keyColumnIdx, valueColumnIdx, columnCount in
 	} else if isTimestamp(line[1]) {
 		output.Warnf("assuming column 1 to be message timestamp. Column will be ignored")
 		return 0, 2, 3, nil
-	} else {
-		return -1, -1, -1, errors.Errorf("line contains unexpected amount of separators:\n%s", line)
 	}
+	return -1, -1, -1, errors.Errorf("line contains unexpected amount of separators:\n%s", line)
 }
 
 func isTimestamp(value string) bool {

util/util.go

@@ -8,8 +8,9 @@ import (
 )
 
 var dateFormats = []string{
-	"2006-01-02T15:04:05.123Z",
-	"2006-01-02T15:04:05.123",
+	"2006-01-02T15:04:05.00000Z",
+	"2006-01-02T15:04:05.000Z",
+	"2006-01-02T15:04:05.000",
 	"2006-01-02T15:04:05Z",
 	"2006-01-02T15:04:05",
 	"2006-01-02T15:04",
@@ -21,8 +22,10 @@ func ParseTimestamp(timestamp string) (time.Time, error) {
 		return time.UnixMilli(timeMs), nil
 	}
 
+	loc, _ := time.LoadLocation("Local")
+
 	for _, format := range dateFormats {
-		if val, e := time.Parse(format, timestamp); e == nil {
+		if val, e := time.ParseInLocation(format, timestamp, loc); e == nil {
 			return val, nil
 		}
 	}